I've gone back to being a bit unsure about my OC, weapon and semblance mostly. I still remember my 3 ideas.

1. The idea I was currently thinking of, some kind of combination melee/thrown/gun which the OC could use his semblance to travel with or teleport to when thrown.

2. Not sure about the weapon but I want it to work with a semblance that can create runic marks that act like land mines that work differently with dust used. Not sure I want this one to work at range like Weiss'.

3. An idea inspired by video games monks. Basically he'd have gloves and boots or something similar to both Yang and Mercury's weapons. Instead of shells they would just have dust that would work with a semblance that would cover his hands and feet in a stronger aura that would allow him to use more powerful kicks and punches. Different dust would empower the strikes in different ways, but using this would also drain is Aura faster than normal meaning it wouldn't work in prolonged fights and wouldn't have much ranged potential.

in the story i write (gold volume 1) the main villain is a humanoid grimm named gladios. he holds a weapon named blood-lust. this weapon, in its original form. it is a large broadsword with a golden blade and a black handle. as the weapon is hundreds of years old, it has many forms, when it destroys another persons weapon. it gains the ability to transform into that weapon in a matter of seconds, gaining both the attributes and the shape of the weapon.

for example, if, by some chance, blood-lust destroyed crescent rose, it would gain the ability to transform into crescent rose and, with a gold colored blade and a black handle, with both long and short range abilities. an overpowered weapon for a overpowered character

Someone early on mentioned an energy gun turret thing, which is a little similar to something I've thought of, and would like to see executed well. Form one is a large kite shield and form two is a protected emplaced machine gun. The idea is that parts on the edges of the shield fall back against the ground to keep it steady and the barrels extend out of the front. Mostly I just want to see more weapons on the show that're powerful machineguns, like the briefcase minigun.

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Both of those images look awesome so I can't argue but I'm imagining more like this, where the shield is larger, the bipod folding up into the shield, and the whole gun part small enough to be out of the way when used as a shield.

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Aye, the character whom this is intended for is meant to have a simple sword-carbine weapon as well, with a fighting style that is meant to fend off close attacks more than do damage. Her role in the team would be ranged dps and holding the line in case of retreat. As for style, imagine the riot shield but a diamond instead of a rectangle, and with a smaller viewing window.

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While I thank you for your help, at the moment I'm honestly willing to handwave technical details like that. For instance, a large bulky shield that's also a machine gun probably requires both hands to carry and isn't much use in a fight, but if you simply say 'this character is a very strong fighter', then it works to have them swing it around as if it were a sheet of cardboard. A rule I've begun using when designing inside the rwby universe is that it's better to be cool than technically viable or even reasonably balanced power-wise. I think a lot of canon characters use that rule too, especially ones we only see a couple times. It's all about how you present them, write them, and choreograph their fights.

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The stabilizing fins are actually fine so long as you add expanding feet on the ends because gunners often sit or stand on the tripods in order to keep them balanced.

Probably want to make it a bit longer so your person isnt crouching just to see.

That design is MUCH closer to what is known as a Kite Shield.

Here is the strapping on the back for them

It uses a tighter strapping then most shields because of its shape. See that long strap? That is meant for use on your back so you can carry it easily.

Now a shield has what is known as a Boss

This is a buckler with a boss which is the part in the middle. kite shields had this. Boss when you punch with them made deflecting attacks MUCH easier as the curve would catch and deflect the blow very easily. They arent that useful on pivot motions like Kite shields use but it can be used with them just not as well as with buckler is all.

So What i am thinking is the barrels form a Boss and this a function in shield form.

Also Kite shields can be used for NASTY attacks. You can for example go for a shield press then use the edge to stab someone's foot. You can keep your arm low and use the top to punch out or in some cases even use it to slice.